Review Questions for Lecture 18
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Constellation and Sky Lore
Sagittarius
Review Questions from the Text
p. 542, 11-15
Review Terms
MACHOS
WIMPS
Rotation Curve
Spiral Density Wave
Review Concepts
How do we measure the mass of our Galaxy? What assumptions
are made about the orbits of the stars?
What is the mass of our Galaxy? Approximately how many
stars are in our Galaxy?
What is the problem of the missing mass? Why do we need
to have some additional dark matter to explain the
observations of the Galaxy's mass?
How many stars are there per cubic parsec in our Galaxy's
core? How does this compare to the solar neighborhood?
What are cosmic rays? What objects might create these particles?